Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1aacf23c9f189a…

MALICIOUS

PDF

77.8 KB Created: 2021-08-28 11:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e835a46891bf38967ce7ca24ec22e7d SHA-1: e33123fbde4b89f033f3bf7387adbce6a44827d2 SHA-256: ca1aacf23c9f189aee4c502780e4c0b118837d77258ba520ded409b81ffe9b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate the file is likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=we+are+infinite+meaning PDF link annotation
    • https://soccerauquebec.com/userfiles/file/mejaterosinazab.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062705301270554.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980172beb75---fudotemegejaxato.pdfIn PDF document text
    • https://jobtiara.com/files/files/zewulifekod.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf89eb9b8a---77280328546.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9295b661f4a10a7fbf2144cfbf126a6d/69546259193.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e349ebce7803def7efb0dc95900af89e/51710793893.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/99848110796.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de64613960f---lotobe.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/92948473563.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xuzunurejez.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/xideguwa.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h5rmjvrk20o1vofa365sv32720/30426631071.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/jamuzagusutifarosupukamux.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/55b11d2824c19a6887c0029c427c6849/xofekudozozidivi.pdfIn PDF document text
    • http://rent-1.es/ckfinder/userfiles/files/sinikunoliwigolita.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/4646717479.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095a02e90cdf---nalegopopibe.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7bdfdfdf63a9108f545ca8ae90b1fcea/farasurolopawesif.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/72370005047.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0cd25cd61d3f91f0cb3e65134560da02/11423180183.pdfIn PDF document text
    • http://vit-physio.de/file/mugamexobedowigapew.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160882ece1c1c4---jabun.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 20288 bytes
SHA-256: 5e27285d1d69e7c55d7a753ce543e5e0089251ff412d677cde1950319f1d18b3
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 10216 bytes
SHA-256: d94dd9922f284992b67ba5f9fcb283f645f27c85e314d8e30e555410779a215f

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